Grand Unified Theories (GUTs) [1]}, [2]}, [3]} provide an interesting framework to study physics beyond the Standard Model (SM). The (partial) unification of matter into larger GUT representations, together with the unification of the gauge couplings, helps to address the flavor puzzle, i.e. the question about the origin of the observed fermion masses, mixing angles and CP violating phases, while explaining the quantization of the hypercharge in the SM.
